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Role of iron ore in enhancing gasification of iron coke:Structural evolution,influence mechanism and kinetic analysis

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International Journal of Minerals,Metallurgy and materials 2025年第1期32卷 58-69页

作者： Jie Wang Wei Wang Xuheng Chen Junfang Bao Qiuyue Hao Heng Zheng Runsheng Xu School of Chemistry and materials Science Hubei Engineering UniversityXiaogan 432000China key laboratory for Ferrous Metallurgy and Resources Utilization of ministry of education Wuhan University of Science and TechnologyWuhan 430081China Institue of Ironmaking technology Baosteel Central Research InstituteShanghai 201999China State key laboratory of Advanced Metallurgy University of Science and Technology BeijingBeijing 100083China

The utilization of iron coke provides a green pathway for low-carbon *** uncover the influence mechanism of iron ore on the behavior and kinetics of iron coke gasification,the effect of iron ore on the microstructure of iron coke was ***,a comparative study of the gasification reactions between iron coke and coke was conducted through non-isothermal thermogravimetric *** findings indicate that compared to coke,iron coke exhibits an augmentation in micropores and specific surface area,and the micropores further extend and *** provides more adsorption sites for CO_(2) molecules during the gasification process,resulting in a reduction in the initial gasification temperature of iron *** the heating rate in non-isothermal gasification can enhance the reactivity of iron *** metallic iron reduced from iron ore is embedded in the carbon matrix,reducing the orderliness of the carbon structure,which is primarily responsible for the heightened reactivity of the carbon *** kinetic study indicates that the random pore model can effectively represent the gasification process of iron coke due to its rich pore ***,as the proportion of iron ore increases,the activation energy for the carbon gasification gradually decreases,from 246.2 kJ/mol for coke to 192.5 kJ/mol for iron coke 15wt%.

关键词： low-carbon ironmaking iron coke gasification structural evolution kinetic model

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Effects of carbon content on the microstructure and tensile properties of a low-density steel

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International Journal of Minerals,Metallurgy and materials 2025年第02期 391-401页

作者： Yongxuan Shang Mingyu Fan Shuyong Jiang Zhongwu Zhang key laboratory of superlight materials and surface technology Ministry of Education College of Materials Science and Chemical Engineering Harbin Engineering University State key laboratory of Metal Material for Marine Equipment and Application Iron & Steel Research Institute of Ansteel Group Corporation

Carbon can change the phase components of low-density steels and influence the mechanical properties. In this study, a new method to control the carbon content and avoid the formation of δ-ferrite by decarburization treatment was proposed. The microstructural changes and mechanical characteristics with carbon content induced by decarburization were systematically examined. Crussard–Jaoul(C–J) analysis was employed to examine the work hardening characteristics during the tensile test. During decarburization by heat treatments, the carbon content within the austenite phase decreased, while Mn and Al were almost unchanged; this made the steel with full austenite transform into the austenite and ferrite dual phase. Meanwhile,(Ti,V)C carbides existed in both matrix phase and the mole fraction almost the same. In addition, the formation of other carbides restrained. Carbon loss induced a decrease in strength due to the weakening of the carbon solid solution. For the steel with the single austinite, the deformation mode of austenite was the dislocation planar glide, resulting in the formation of microbands. For the dual-phase steel, the deformation occurred by the dislocation planar glide of austenite first, with the increase in strain, the cross slip of ferrite took place, forming dislocation cells in ferrite. At the late stage of deformation, the work hardening of austinite increased rapidly, while that of ferrite increased slightly.

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Preparing different phases of Mg-Li-Sm alloys by molten salt electrolysis in LiCl-KCl-MgCl_2-SmCl_3 melts

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Journal of Rare Earths 2010年第2期28卷 227-231页

作者：韩伟田阳张密林叶克赵全友魏树权 key laboratory of superlight materials & surface technology Ministry of EducationHarbin Engineering University

Different phases of Mg-Li-Sm alloys were prepared by galvanostatic electrolysis in LiCl-KCl-MgCl2-SmCl3 melts at 670 °*** electrolysis process and phase control of Mg-Li-Sm alloys were *** microstructures of α,α+β,β phases of Mg-Li-Sm alloys were characterized by X-ray diffraction(XRD) and optical microscope(OM).Analysis of scanning electron microscopy(SEM) and EDS mapping analysis showed that Mg distributed homogeneously in Mg-Li-Sm *** result showed that the distribution of Sm was more at...

关键词： Mg-Li-RE alloys electrodeposition molten salt rare earths

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Electrochemical behaviour of erbium and preparation of Mg-Li-Er alloys by codeposition

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Journal of Rare Earths 2011年第8期29卷 763-767页

作者：曹鹏张密林韩伟颜永得魏树权郑涛 key laboratory of superlight materials & surface technology of ministry of education Harbin Engineering University

The electrodeposition of erbium on molybdenum electrodes and the formation of Mg-Li-Er alloys were investigated in LiCl-KCl molten salts. At a molybdenum electrode, the electroreduction of Er （III） proceeded in a one-step process involving three electrons. The diffu-sion coefficient of erbium ions in the melts was determined by cyclic voltammetry, chronopotentiometry and chronoamperometry respectively. Cyclic voltammograms （CVs） showed that the underpotential deposition （UPD） of lithium on pre-deposited Mg-Er alloy led to the formation of a Mg-Li-Er alloy. X-ray diffraction （XRD） indicated that Er5Mg24 phase was formed via potentiostatic electrolysis. Scanning electron microscopy （SEM） showed that Er atoms mainly concentrated at the grain boundaries while Mg element evenly located in the alloy.

关键词： electrodeposition rare earth molten salt LiCl-KCl electrolysis

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Electrochemical behaviour and codeposition of Al-Li-Er alloys in LiCl-KCl-AlCl_3-Er_2O_3 melts

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Journal of Rare Earths 2013年第2期31卷 192-197页

作者：孙怡张密林韩伟颜永得杨育圣孙运霞 key laboratory of superlight materials and surface technology Ministry of EducationCollege of Materials Science and Chemical EngineeringHarbin Engineering University

The electrochemical behaviour of Al, Li, and Er were investigated by electrochemical techniques, such as cyclic voltammograms, chronopotentiometric, chronoamperograms, and open circuit chronopotentiogram on molybdenum electrodes. The results showed that the underpotential deposition of erbium on pre-deposited Al electrodes formed two Al-Er intermetallic compounds. The codeposition of Al, Li, Er occurred and formed Al-Li-Er alloys in LiCl-KCl-AlCl3 -Er2O3 melts at 773K. Different phases such as Al2Er, Al2Er3 and βLi phase of Al-Li-Er alloys were prepared by galvanostatic electrolysis and characterized by X-ray diffraction （XRD）. Scanning electron microscopy （SEM） indicated that Er element mainly distributed at the grain boundary. ICP analyses showed that lithium and erbium contents of Al-Li-Er alloys could be controlled by AlCl3 and Er2O3 concentration and electrochemical parameters.

关键词： Al-Li-Er alloys electrochemical codeposition rare earth oxide molten salt

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Corrosion protection of AZ31 magnesium alloy treated with La^(3+) modified 3-methacryloxypropyltrimethoxysilane conversion film

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Journal of Rare Earths 2015年第6期33卷 647-654页

作者：乔英杰李文鹏王桂香张晓红 key laboratory of superlight materials and surface technology Ministry of Education College of Materials Science and Chemical Engineering Harbin Engineering University

This study demonstrated the influence of addition concentration of La3＋ on the anti-corrosion behavior of a 3-methacry- loxypropyltrimethoxysilane （MPS） film formed on AZ31 magnesium alloy. The morphology and surface chemistry of the samples were evaluated through scanning electron microscopy （SEM） and Fourier transform infrared spectroscopy （FT-IR）, respectively. The corrosion resistance of the pre-treated AZ31 magnesium alloy was studied during immersion in 0.1 mol/L NaC1 solution, using poten- tiodynamic polarization curves and electrochemical impedance spectra （EIS）. In comparison to MPS film, the low concentration of La3＋ ion modified silane layer exhibited a better anti-corrosion performance, nevertheless, the high concentration of La3＋ ion modified was worse. Results showed that the preferable addition concentration of La3＋ ion in the silane film was 5Х 10-4 mol/L in this experi- ment.

关键词： AZ31 Mg alloy silanes lanthanum corrosion rare earths

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Effects of holmium and hot-rolling on microstructure and mechanical properties of Mg-Li based alloys

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Journal of Rare Earths 2016年第12期34卷 1269-1276页

作者：穆佳郭浩邹云许松松张中武 key laboratory of superlight materials and surface technology Ministry of Education College of Materials Science and Chemical Engineering Harbin Engineering University

A rare earth holmium（Ho） element was introduced into Mg-8Li-3Al alloy to investigate the effects of holmium and hot-rolling on the microstructure and mechanical properties of the Mg-Li based alloys. Both alloys with and without Ho showed a duplex structure with α and β phases. The as-cast Mg-8Li-3Al alloy exhibited a yield strength（YS） of 111.1 MPa, ultimate tensile strength（UTS） of 148.2 MPa and an elongation of 9.50% while the hot-rolled Mg-8Li-3Al-3Ho alloy had a yield strength of 249.7 MPa, ultimate tensile strength of 293.1 MPa with an elongation of 21.40%. These results indicated that both strength and ductility could be significantly enhanced by addition of holmium together with thermo-mechanical treatment. It was found that the microstructure could be refined significantly and the fracture modes changed from partial brittle to ductile fracture due to the addition of holmium. The effects of microstructure refinement, work hardening and solid solution strengthening induced by the addition of holmium and hot-rolling on the mechanical properties were discussed.

关键词： Mg-Li alloy holmium microstructure grain refinement mechanical properties rare earths

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Preparation of Mg-Yb alloy film by electrolysis in the molten LiCl-KCl-YbCl_3 system at low temperature

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Journal of Rare Earths 2010年第1期28卷 128-133页

作者：陈野叶克张密林 key laboratory of superlight materials & surface technology Ministry of EducationCollege of Materials Science and Chemical EngineeringHarbin Engineering University

The electrochemical behavior of Yb3+ and electrodeposition of Mg-Yb alloy film at solid magnesium cathode in the molten LiCl-KCl-YbCl3(2 wt.%) system at 773 K was *** electrochemical techniques,such as cyclic voltammetry,chronopotentiometry and chronoamperometry were used in order to explore the deposition mechanism of *** reduction process of Yb3+ is stepwise reactions which are single-electron and double-electron reversible charge transfer *** speed control step was a diffu...

关键词： LiCl-KCl eutectic molten salt Mg-Yb alloy films electrolysis low temperature rare earths

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Electrochemical Preparation of Mg-Li-Al-Er Alloys by Co-reduction in Molten Chloride

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Acta Metallurgica Sinica(English Letters) 2013年第4期26卷 455-460页

作者： Yi SUN Milin ZHANG Wei HAN Mei LI Yusheng YANG Yongde YAN Meng ZHANG key laboratory of superlight materials and surface technology Ministry of EducationCollege of Materials Science and Chemical EngineeringHarbin Engineering University

The electrochemical behavior of Mg, Li, AI and Er were investigated by electrochemical techniques in LiCI- KCI-MgCI2-AICI3-ErCI3 melts at 823 K. The cyclic voltammetry and chronopotentiometry indicated that the co-reduction of Mg, Li, AI and Er occurs at current densities more negative than -0.89 ***-2. Er（lll） under-potential deposited on pre-reduced AI electrode formed AI-RE alloys. X-ray diffraction （XRD） results indicated that Mg17Al12, Al2Er, Al2Er3 and Al4Li9 phases were prepared by galvanostatic electrolysis. ICP analyses of samples showed that lithium and aluminum contents of Mg-Li-AI-Er alloys could be controlled by concentration of AICI3 and cathodic current density.

关键词： Mg-Li based alloys Co-reduction Rare earth Molten salt electrolysis

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Progress in preparation of rare earth metals and alloys by electrodeposition in molten salts

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Rare Metals 2016年第11期35卷 811-825页

作者： Wei Han Mei Li Mi-Lin Zhang Yong-De Yan key laboratory of superlight materials and surface technology Ministry of EducationCollege of Materials Science and Chemical EngineeringHarbin Engineering University

Rare earth（RE） metals and their alloys have attracted considerable practical interests due to their functional properties. Because of their negative deposition potentials, RE metals cannot be electrochemically deposited from aqueous media. Using molten salt as medium provides a unique opportunity for the electrowinning and electrorefining of high-purity RE metals, as well as for the electrochemical formation of their alloys and intermetallic compounds. Certainly, the electrochemical behaviors of RE metals and their alloys have been investigated in a number of different molten salts comprising all-fiuorides,all-chlorides and mixed chloride-fiuoride media. Based on the results, RE and their alloys were produced by molten salt electrolysis. In this paper, the developments of preparation of RE metals and their alloys by electrolysis in molten salts in recent years were systematically summarized on both the local and international levels. Attention was paid mainly to the electrodeposition of RE metals and their alloys, including RE-Mg, RE-Al, RE-Ni, RE-Co,RE-Cu, RE-Fe and RE-Zn alloys.

关键词： Electrochemical formation Molten salts Electrolysis Rare earth Alloys

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